Combined alarm-clock and fire-signal.



J. STEVENS. COMBINED ALARM CLOCK AND FIRE SlGNAL.

APPLICATION FILED FEB. 24. 1914.

PatentedSept. 18, 1917.

3 SHEETS-SHEET I.

J. STEVENS. COMBINED ALARM CLOCK AND FIRE SIGNAL.

APPLICATON FILED FEB. 24 914- 1,240,61 8. Patented Sept. 18, 1917.

3 $HEETS-$HEET 2.

2022 266 15 66/ Z'7'z even/ion WIWfiI/g w l. STEVENS.

COMBINED ALARM CLOCK AND FIRE SIGNAL. APPLICATION FILED FEB. 24, 1914.

1 340,61 8 Patented Sept. 18,1917.

3 SHEETS-SHEET 3.

5 A 25 i o A fw- W6 %@e as-s as; mm, 272 Uevofor" Wan/fife wand JOHN s'rnvrms, or muncnsron, TASMANIA, AUSTRALIA.

COMBINED ALARM-CLOCK AND FIRE-SIGNAL.

To all whom it may concern:

Be it known that I, JOHN subject of the King of Gt. Britain, resi ing at 41 George street, Launceston, in the State of Tasmania, Commonwealth of Aus= tralia, watchmaker, have invented certain new and useful Improvements in Combined.

Alarm-Clocks and, Fire-Signals, the following is a specification.

This invention contemplates the employment of the ordinary household "or other alarm-clock as a fire-signal by combining of which therewlth a thermostat adapted to releasethe alarm mechanism thereof without interfering with the ordinary setting of the alarm.

For this purpose the free end of a the-rmostat is adapted to either directly or indirectly release the strikinghammer of the clock alarm mechanism so that on a predetermined rise of temperaturethe flexure of the thermostat automatically releases the hammer which sounds the bell or gong.

According to this invention a compound thermostatic bar, curved in general conformity to the outline of the bell, is mounted on the alarm clock beneath the bell or gong and convenient to the hammer in such a manner as to normally retain said hammer against the action of the pallet staff which isadapted to be freed either by the movement of the free end of the thermostatic bar or by the movement of the releasing.

spring of the ordinary alarm setting mechanism of the clock work.

By this means when the temperature rises to a predetermined degree the hammer of the bell is freed and the alarm sounded.

The appended sheets of drawings illustrate practical forms of the-invention. Figure 1 is a rear internal view of those parts of an Ansonia alarm clock to which the invention relates with the bell in section. Fig. 2 is a plan view partly in section with the alarm bell removed.

Figs. 3 and 4: are

5 views illustrating certain variations while 1 away of these parts of a ,Fig. 5 is a detail sideview of a part of Fi 4.

Fig. 6 is an elevation of the regulating and testing device shown in Fig.2.

Fig. 7 -is a rear view with parts broken Columbia alarm clock to which the invention relates and Fig. 8 is a transverse section on the line 8-8 of Fig. 7 and Specification of Letters Patent.

STEVENS, a

fragmentary detail plan Fig. 5. The lever12, as shown, has a con- Patented Sept. 18, 1917.

- Application filed February 24;, 1914. Serial No. 820,714.

Fig. 9 is a detail of Figs. 7 and 8.

Fig. 10 illustrates the application ofthe invention to a Big Ben alarm clock provided with repeat alarm mechanism.

Figs. 11, 12, 13, 14 are enlarged details of parts of Fig. 10.

Referring to the embodiment-of the invention shown in Figs. 1 and 2 a Wire 1 is attached to the usual releasing spring 2 and extended to. contact with one arm 3 of a spring controlled lever 4 which normally arrests the hammer 5 of the bell said' hammer being mounted on the pallet stafl' 6 of the alarm mechanism. In thls case the other end 7 of the lever contacts with the free 'end 8 of the thermostatic bar 9 which is attached at one end to a plate P or casing O of the clock. Thus when either the wire 1' lever is moved in the direction of arrow to' hold back or prevent the forward movement of the Wire 1 attached to 'the releasing spring 2. 1

According to another simplified embodiment of the invention (Fig. 3) the lever 4:

may be dispensed with in which case the free end 8 of the thermostatic bar is placed in direct contact with a nib 11 provided on the hammer 5 or rod thereof and with the wire or the like 1 connected to the releasing spring of the ordinary alarm setting mechanism as in Figs. 1 and 2. d

Fig. 4 illustrates anindirect connection bever 12 is employed which is operated upon tween the free end of the bar and the wire whereby an intervening spring controlled leby the movement of the wire and engaging the free end 8 of the bar presses same mward and releases the hammer. The nib 11 in this case may engage a projection on the end of a recess in the bar'as illustrated in trolling spring but instead of this arrangement said controlhng spring may be omitted and the lever may be formed with a. notch -which engages thethermostat bar so that the said bar functions also as the controlling spring for said lever. The cut-out 10 may also be employed in the construction shown in Figs. 3 and 4.

In a further example of the invention.

' (Figs. 7, 8,'and 9) the end 8 of the compound thermostatic bar contacts with the nib 11 on the hammer 5 as in Fig. 9 and a lever 12 is connected to the releasing spring 2 and adapted to bear against the free end of the bar. This construction is particularly applicable to a Columbia alarm clock and the ordinary arm thereof that engages the releasing -spring 2 and the out out arm both usually mounted on the pallet staff 6 are dispensed with and the cut out is efiected by an arm 13 attached to the cut outslide l4 and formed with an inclined end 15 which is adapted to bear against the limb 16 of the lever. Thus when the slide is moved for ward theinclined end 15 prevents the lever being operated.

"An adjusting device such as a screw 17 Fig. 2 bearing against the thermostatic bar may be employed for determining the degree of temperature at which the fire alarm will be given, which screw is provided with an indicator 18 adapted to traverse a graduated scale 19.

Furthermorea press button 20 adapted to be pressed against the thermostatic bar may be employed for testing the alarm mechanism.

Referring to Figs. 1014 illustrating the Big Ben alarm peat alarm mechanism the end 8 of the thermostat bar 9 engages the lever 4 which contacts with a nib 11 on the hammer 5. The wire 1 is attached to the releasing spring 2 and bears against a lever 12 which when the spring is released strikes the spring controlled lever 4 and releases the hammer at the set time for the alarm. The flexure of the thermostat bar under heat also frees the lever 4 from the nib 11 on the hammer and sounds an alarm.

In order to throw the repeat alarm lever 21 out of action when the thermostat ,bar causes the alarm, a rod 22 is attached to said bar and bears against the pillar 23'. Thefree end of the rod moves forward when the bar expands and engages the projection 24 on the end of the lever 22 thus preventing the catch 25 o l-the latter engaging the proection 26 on the pallet 27. It-,. will be eviand clock provided with a rep the catch 25 in engagement with the projection 26 t e operation of the fire alarm mechanism would be prevented, hence the necessity of this rod 22.

When the invention is applied to a Big Ben alarm clock the tooth 28 on the end of the spring 2 that normally arrests the wheel 29 which usually operates the pallet, is dispensed with as the levers 4 and 12 accomplish the object.

The cut-out device for throwing the ordinary alarm out of action consists of a slide 14 to which is attached a wire 13 with a hook 30 adapted'to prevent movement of the lever 12.

The thermostat bar 9 is formed near its fixed end with an incline 31 against which a slide 32 provided with a pointer bears. The movement of the slide adjusts the bar so determines at what degree of temperature the fire alarm will be given. The pointer of the slide traverses a graduated scale as in Fig. 14.

It is to be understood that this invention is applicable to other alarm clocks.

I claim:-

The combination with an alarm clock having the usual alarm bell, hammer, alarm train for operating said hammer and releasing spring for said train, of a thermostatic bar arranged beneath said bell and curved in general conformity thereto, said bar having a fixed end and a free end, and by means of its free end eration of said hammer, the bar when ex panded by heat eflecting the release of said hammer and a rod connected to the releasing spring and operative by said spring to effect the release of said hammer independently of said bar.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN STEVENS.

Witnesses:

EDWARD WATERS,

EDWARD N. WATERS.

alarm clocks as well as Ansonla, Columbia and Big Ben controlling the op 

